基于非均匀曳力模型的CFB循环特性研究  

Study on Circulating Characteristics of a Circulating Fluidized Bed Using the Non-Uniform Drag Model

作　　者：刘洋 霍鹏举 李晓宏 祁海鹰[1] LIU Yang;HUO Peng-Ju;LI Xiao-Hong;QI Hai-Ying(Key Laboratory for Thermal Science&Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China;Hydrocarbon High-efficiency Utilization Technology Research Center,Shaanxi Yanchang Petroleum Co.Ltd.,Xi'an 710075,China)

机构地区：[1]清华大学热科学与动力工程教育部重点实验室,北京100084 [2]陕西延长石油有限责任公司碳氢高效利用技术研究中心,西安710075

出　　处：《工程热物理学报》2020年第6期1440-1444,共5页Journal of Engineering Thermophysics

基　　金：陕西延长石油集团碳氢高效利用技术研究中心资助项目。

摘　　要：为了给工业级循环流化床(CFB)煤气化反应器的运行调试提供有效的参考依据,在操作参数之一--颗粒质量循环流率Gs未知的情况下,本文采用具有宽工况普适能力的QC-EMMS非均匀曳力模型和欧拉-欧拉数值方法,模拟了提升管内的气固两相流动,准确给出了该装置的循环特性,即不同流化风速下颗粒质量循环流率Gs与床存量的关系曲线,揭示了实际过程中可能存在的A类噎塞现象,以及发生噎塞前后,床内颗粒浓度分布的变化规律。研究表明,欧拉方法和QC-EMMS模型可在各类大型CFB系统运行的改进、放大和优化中发挥应有的重要作用。To provide effective supports for operations of an industrial-scale circulating fluidized bed(CFB)coal gasification reactor with unknown particle mass circulation rate Gs,the fluidization processes under various cold-flow conditions in the riser of the CFB reactor were simulated using the QC-EMMS non-uniform drag model coupled into the Eulerian framework.The circulating characteristics were predicted to reveal the relations between Gs and bed inventory for various superficial gas velocities.The type-A choking area was captured by simulations and the characteristics of particle concentration distributions under different fluidization conditions were analyzed.The results show that the Eulerian framework with the QC-EMMS drag model can play an important role in improving and optimizing the operations of various large-scale CFB systems.

关 键 词：循环流化床煤气化反应器 循环特性 QC-EMMS非均匀曳力模型 A类噎塞 

分 类 号：TQ051[化学工程]